booker.slint

// Copyright © SixtyFPS GmbH <info@slint.dev>
// SPDX-License-Identifier: MIT

import { LineEdit, Button, ComboBox, GridBox } from "std-widgets.slint";

export component Booker inherits Window {
    // returns true if the string parameter is a valid date
    pure callback validate-date(string) -> bool;
    // returns true if the first date is before the second date and they are both valid
    pure callback compare-date(string, string) -> bool;

    validate-date(_) => { true }
    compare-date(a, b) => { a <= b }

    private property <bool> message-visible;

    GridBox {
        combo := ComboBox {
            row: 0;
            model: ["one-way flight", "return flight"];
            current-value: "one-way flight";
            current-index: 0;
        }
        t1 := LineEdit {
            row: 1;
            text: "27.03.2014";
        }
        Rectangle {
            row: 1; // over the previous line edit
            background: root.validate-date(t1.text) ? transparent : #f008;
        }
        t2 := LineEdit {
            row: 2;
            text: "27.03.2014";
            enabled: combo.current-index == 1;
        }
        Rectangle {
            row: 2; // over the previous line edit
            background: root.validate-date(t2.text) ? transparent : #f008;
        }
        Button {
            row: 3;
            text: "Book";
            clicked() => { root.message-visible = true; }
            enabled: combo.current-index != 1 ? root.validate-date(t1.text) : root.compare-date(t1.text, t2.text);
        }
    }

    if (root.message-visible) : Rectangle {
        width: 100%;
        height: 100%;
        background: #ee8;
        Text {
            width: 100%;
            height: 100%;
            text: "You have booked a " + combo.current-value + " on " + t1.text;
            vertical-alignment: center;
            horizontal-alignment: center;
        }
        TouchArea {
            width: 100%;
            height: 100%;
            clicked => { root.message-visible = false; }
        }
    }
}